What is best customer support software online?

I am running a small business online now and i really do not want to do too much job one customer service. Can i use a customer support software? What is the best customer support online? How can i use it? Please help! I saw a free customer support software online last night, it is called iKode Helpdesk X, I want to buy it but i am not sure whether it works? Here is the website: http://www.phphelpdesk.org/, please give me some useful advise. Thank you very much!